Welcome to the forum @yanose The CX-50 should be bigger than the CX-5 both on the inside and outside. It's even wider than the CX-9.
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While the CX-30 that lends its platform is a subcompact SUV, the CX-50 is a bit bigger in almost every dimension than the compact CX-5. It's longer, wider and has more ground clearance, however overall height is a bit lower. The size pays dividends inside, too, with greater legroom than the CX-5, although Coleman couldn't give any specific dimensions for the CX-50 inside or out. He also said that the CX-50 is wider even than the CX-9, and as a result, it would actually be too wide to build at Mazda's Hiroshima facility, hence its production at the new Mazda-Toyota joint plant in Alabama. Mazda was also able to go with these dimensions since the CX-50 is designed for North America, so making sure it was usable down tight Japanese and European streets wasn't a priority.
2023 Mazda CX-50 is bigger, burlier than CX-5
2023 Mazda CX-50 is a slightly larger than compact SUV targeted at North America. It also features an upgraded drivetrain.

While the CX-30 that lends its platform is a subcompact SUV, the CX-50 is a bit bigger in almost every dimension than the compact CX-5. It's longer, wider and has more ground clearance, however overall height is a bit lower. The size pays dividends inside, too, with greater legroom than the CX-5, although Coleman couldn't give any specific dimensions for the CX-50 inside or out. He also said that the CX-50 is wider even than the CX-9, and as a result, it would actually be too wide to build at Mazda's Hiroshima facility, hence its production at the new Mazda-Toyota joint plant in Alabama. Mazda was also able to go with these dimensions since the CX-50 is designed for North America, so making sure it was usable down tight Japanese and European streets wasn't a priority.